Improve entries endpoint for large export to json/csv

Add entries endpoint for query multiple entries for batch export to JSON

• Limit maximum number of items
• Only export "visible" columns
• Potentially allow export to CSV format (beyond JSON)

added API current feature labels

assigned to @g-haoyuyang

created branch 2263-improve-entries-endpoint-for-large-export-to-json-csv to address this issue

mentioned in merge request !2315 (merged)

mentioned in commit 93fbbea3

closed with merge request !2315 (merged)